java多态性、包、，

Question

大家好，我正在做作业，我被卡住了，所以我需要一些反馈

我在一个包中有一个抽象类Gear和enum类型信息，然后有InfoTest，它使用assert和junit测试来测试Gear和信息的正确性

问题在于信息测试。我有Info g = some Value;和g.getWeight()哪个方法在Gear类中，我无法通过Info对象从InfoTest访问getWeight（）方法

所以我想知道是否有一种方法可以通过InfoTest中的Info对象访问getWeight（），或者我的老师犯了一个错误。萨克斯

好的，这里是一些代码示例

public abstract class Gear {

/**
 * weight stores the weight of the item in kg
 */
protected int weight;

/**
 * code store the code for the item (bedding, food, medical or sanitary, but it is better to use array.
 */
protected char code;

/**getWeight gets the weight of the item.
 * 
 * @return weight
 */        
public int getWeight() {
    return weight;
}

/**setWeight sets the weight for the item
 * 
 * @param weight 
 */
public void setWeight(int weight) {
    this.weight = weight;
}

/**getCode() gets the code of the item.
 * 
 * @return code
 */
public char getCode() {
    return code;
}

/**setCode sets the code of the item.
 * 
 * @param code 
 */
public void setCode(char code) {
    this.code = code;
} }

public enum Info {

/**
 * BLANKETS represent the blankets.
 */
BLANKETS,

/**
 * PILLOWS represent the pillows 
 */
PILLOWS,

/**
 * FOOD represent the food
 */
FOOD,

/**
 * MEDKIT represent the medical kit.
 */
MEDKIT,

/**
 * OXYGEN represent the oxygen 
 */
OXYGEN,

/**
 * NAPKINS represent the napkins.
 */
NAPKINS,

/**
 * SICKNESSBAG represent the sickness bags.
 */
SICKNESSBAG
 }

> public class InfoTest {  
      /**
>      * Test of getWeight() method, of class Info. 
>      */
>     @Test
>     public void testGetWeight() {
>       System.out.print("\tChecking weights in Info");
>       Info g = Info.BLANKETS;
>       final int expectedValue1 = 2;
>       assertEquals(expectedValue1, g.getWeight()); }
> 
> }
  

Answer 1

问题是Info是一个枚举类，它目前无法访问Gear类。很难准确地计算出你的家庭作业的范围

像这样的。。。 首先，创建另一个扩展抽象类的类（比如SubGear）

public SubGear extends Gear

在这个类中，我们有一个构造函数，它接受Info对象，并像这样填充Gear类中的字段：

public SubGear (Info info, int weight, char code){
    this.code = code;
    this.weight= weight;
    this.info = info
}

public void setInfo(Info info){
     this.info = info;
}

public Info getInfo(){
    return info;
}

然后在测试中创建一个新的SubGear对象，以便根据需要访问getWeight